diff --git a/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py b/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
index c0e81a09..d3c9ca5d 100644
--- a/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
+++ b/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
@@ -58,7 +58,6 @@ class TestChangeAttributes(EndpointTester):
         self.operation3.refresh_from_db()
         self.ks3 = RSForm(self.operation3.result)
 
-
     @decl_endpoint('/api/library/{item}/set-owner', method='patch')
     def test_set_owner(self):
         data = {'user': self.user3.pk}
diff --git a/rsconcept/backend/apps/oss/tests/s_propagation/t_constituents.py b/rsconcept/backend/apps/oss/tests/s_propagation/t_constituents.py
index c8ccefce..ae160773 100644
--- a/rsconcept/backend/apps/oss/tests/s_propagation/t_constituents.py
+++ b/rsconcept/backend/apps/oss/tests/s_propagation/t_constituents.py
@@ -57,6 +57,33 @@ class TestChangeConstituents(EndpointTester):
         self.ks3 = RSForm(self.operation3.result)
         self.assertEqual(self.ks3.constituents().count(), 4)
 
+    @decl_endpoint('/api/rsforms/{item}/details', method='get')
+    def test_retrieve_inheritance(self):
+        response = self.executeOK(item=self.ks3.model.pk)
+        self.assertEqual(response.data['oss'], [{'id': self.owned.model.pk, 'alias': 'T1'}])
+        self.assertEqual(response.data['inheritance'], [
+            {
+                'child': Constituenta.objects.get(as_child__parent_id=self.ks1X1.pk).pk,
+                'child_source': self.ks3.model.pk,
+                'parent': self.ks1X1.pk, 'parent_source': self.ks1.model.pk
+            },
+            {
+                'child': Constituenta.objects.get(as_child__parent_id=self.ks1X2.pk).pk,
+                'child_source': self.ks3.model.pk,
+                'parent': self.ks1X2.pk, 'parent_source': self.ks1.model.pk
+            },
+            {
+                'child': Constituenta.objects.get(as_child__parent_id=self.ks2X1.pk).pk,
+                'child_source': self.ks3.model.pk,
+                'parent': self.ks2X1.pk, 'parent_source': self.ks2.model.pk
+            },
+            {
+                'child': Constituenta.objects.get(as_child__parent_id=self.ks2D1.pk).pk,
+                'child_source': self.ks3.model.pk,
+                'parent': self.ks2D1.pk, 'parent_source': self.ks2.model.pk
+            },
+        ])
+
     @decl_endpoint('/api/rsforms/{schema}/create-cst', method='post')
     def test_create_constituenta(self):
         data = {
diff --git a/rsconcept/backend/apps/rsform/serializers/__init__.py b/rsconcept/backend/apps/rsform/serializers/__init__.py
index 5916b6ae..9792f640 100644
--- a/rsconcept/backend/apps/rsform/serializers/__init__.py
+++ b/rsconcept/backend/apps/rsform/serializers/__init__.py
@@ -4,6 +4,7 @@ from .basics import (
     ASTNodeSerializer,
     ExpressionParseSerializer,
     ExpressionSerializer,
+    InheritanceDataSerializer,
     MultiFormSerializer,
     ResolverSerializer,
     TextSerializer,
diff --git a/rsconcept/backend/apps/rsform/serializers/basics.py b/rsconcept/backend/apps/rsform/serializers/basics.py
index 40afd0a5..4dbe7e5b 100644
--- a/rsconcept/backend/apps/rsform/serializers/basics.py
+++ b/rsconcept/backend/apps/rsform/serializers/basics.py
@@ -122,6 +122,14 @@ class ReferenceSerializer(serializers.Serializer):
     pos_output = TextPositionSerializer()
 
 
+class InheritanceDataSerializer(serializers.Serializer):
+    ''' Serializer: inheritance data. '''
+    child = serializers.IntegerField()
+    child_source = serializers.IntegerField()
+    parent = serializers.IntegerField()
+    parent_source = serializers.IntegerField()
+
+
 class ResolverSerializer(serializers.Serializer):
     ''' Serializer: Resolver results serializer. '''
     input = serializers.CharField()
diff --git a/rsconcept/backend/apps/rsform/serializers/data_access.py b/rsconcept/backend/apps/rsform/serializers/data_access.py
index 2a8593a3..4b1a8d57 100644
--- a/rsconcept/backend/apps/rsform/serializers/data_access.py
+++ b/rsconcept/backend/apps/rsform/serializers/data_access.py
@@ -17,7 +17,7 @@ from apps.oss.models import Inheritance
 from shared import messages as msg
 
 from ..models import Constituenta, CstType, RSForm
-from .basics import CstParseSerializer
+from .basics import CstParseSerializer, InheritanceDataSerializer
 from .io_pyconcept import PyConceptAdapter
 
 
@@ -103,7 +103,7 @@ class RSFormSerializer(serializers.ModelSerializer):
         child=CstSerializer()
     )
     inheritance = serializers.ListField(
-        child=serializers.ListField(child=serializers.IntegerField())
+        child=InheritanceDataSerializer()
     )
     oss = serializers.ListField(
         child=LibraryItemReferenceSerializer()
@@ -116,8 +116,17 @@ class RSFormSerializer(serializers.ModelSerializer):
 
     def to_representation(self, instance: LibraryItem) -> dict:
         result = self.to_base_data(instance)
-        for link in Inheritance.objects.filter(Q(child__schema=instance) | Q(parent__schema=instance)):
-            result['inheritance'].append([link.child.pk, link.parent.pk])
+        inheritances = Inheritance.objects \
+            .filter(Q(child__schema=instance) | Q(parent__schema=instance)) \
+            .select_related('parent__schema', 'child__schema') \
+            .only('parent__id', 'parent__schema__id', 'child__id', 'child__schema__id')
+        for link in inheritances:
+            result['inheritance'].append({
+                'child': link.child_id,
+                'child_source': link.child.schema_id,
+                'parent': link.parent_id,
+                'parent_source': link.parent.schema_id
+            })
         return result
 
     def to_base_data(self, instance: LibraryItem) -> dict:
diff --git a/rsconcept/frontend/src/components/info/InfoConstituenta.tsx b/rsconcept/frontend/src/components/info/InfoConstituenta.tsx
index 2b4b8c83..23187ada 100644
--- a/rsconcept/frontend/src/components/info/InfoConstituenta.tsx
+++ b/rsconcept/frontend/src/components/info/InfoConstituenta.tsx
@@ -39,16 +39,16 @@ function InfoConstituenta({ data, className, ...restProps }: InfoConstituentaPro
           {data.definition_resolved}
         </p>
       ) : null}
-      {data.parent_alias ? (
+      {data.spawner_alias ? (
         <p>
           <b>Основание: </b>
-          {data.parent_alias}
+          {data.spawner_alias}
         </p>
       ) : null}
-      {data.children_alias.length > 0 ? (
+      {data.spawn_alias.length > 0 ? (
         <p>
           <b>Порождает: </b>
-          {data.children_alias.join(', ')}
+          {data.spawn_alias.join(', ')}
         </p>
       ) : null}
       {data.convention ? (
diff --git a/rsconcept/frontend/src/models/RSFormLoader.ts b/rsconcept/frontend/src/models/RSFormLoader.ts
index 1ad6b30c..6685a9e4 100644
--- a/rsconcept/frontend/src/models/RSFormLoader.ts
+++ b/rsconcept/frontend/src/models/RSFormLoader.ts
@@ -3,6 +3,7 @@
  */
 
 import { Graph } from './Graph';
+import { LibraryItemID } from './library';
 import { ConstituentaID, CstType, IConstituenta, IRSForm, IRSFormData, IRSFormStats } from './rsform';
 import { inferClass, inferStatus, inferTemplate, isBaseSet, isFunctional } from './rsformAPI';
 import { ParsingStatus, ValueClass } from './rslang';
@@ -59,27 +60,34 @@ export class RSFormLoader {
   }
 
   private inferCstAttributes() {
-    const inherit_children = new Set(this.schema.inheritance.map(item => item[0]));
-    const inherit_parents = new Set(this.schema.inheritance.map(item => item[1]));
+    const parent_schemas = new Map<ConstituentaID, LibraryItemID>();
+    this.schema.inheritance.forEach(item => {
+      if (item.child_source === this.schema.id) {
+        parent_schemas.set(item.child, item.parent_source);
+      }
+    });
+    const inherit_children = new Set(this.schema.inheritance.map(item => item.child));
+    const inherit_parents = new Set(this.schema.inheritance.map(item => item.parent));
     this.graph.topologicalOrder().forEach(cstID => {
       const cst = this.cstByID.get(cstID)!;
       cst.status = inferStatus(cst.parse.status, cst.parse.valueClass);
       cst.is_template = inferTemplate(cst.definition_formal);
       cst.cst_class = inferClass(cst.cst_type, cst.is_template);
-      cst.children = [];
-      cst.children_alias = [];
+      cst.spawn = [];
+      cst.spawn_alias = [];
+      cst.parent_schema = parent_schemas.get(cst.id);
       cst.is_inherited = inherit_children.has(cst.id);
-      cst.is_inherited_parent = inherit_parents.has(cst.id);
+      cst.has_inherited_children = inherit_parents.has(cst.id);
       cst.is_simple_expression = this.inferSimpleExpression(cst);
       if (!cst.is_simple_expression || cst.cst_type === CstType.STRUCTURED) {
         return;
       }
-      cst.parent = this.inferParent(cst);
-      if (cst.parent) {
-        const parent = this.cstByID.get(cst.parent)!;
-        cst.parent_alias = parent.alias;
-        parent.children.push(cst.id);
-        parent.children_alias.push(cst.alias);
+      cst.spawner = this.inferParent(cst);
+      if (cst.spawner) {
+        const parent = this.cstByID.get(cst.spawner)!;
+        cst.spawner_alias = parent.alias;
+        parent.spawn.push(cst.id);
+        parent.spawn_alias.push(cst.alias);
       }
     });
   }
@@ -107,7 +115,7 @@ export class RSFormLoader {
     if (sources.size !== 1 || sources.has(target.id)) {
       return undefined;
     }
-    const parent_id = sources.values().next().value as ConstituentaID;
+    const parent_id = sources.values().next().value!;
     const parent = this.cstByID.get(parent_id);
     if (parent && isBaseSet(parent.cst_type)) {
       return undefined;
@@ -122,7 +130,7 @@ export class RSFormLoader {
       node.inputs.forEach(id => {
         const parent = this.cstByID.get(id)!;
         if (!parent.is_template || !parent.is_simple_expression) {
-          sources.add(parent.parent ?? id);
+          sources.add(parent.spawner ?? id);
         }
       });
       return sources;
@@ -133,7 +141,7 @@ export class RSFormLoader {
     bodyDependencies.forEach(alias => {
       const parent = this.cstByAlias.get(alias);
       if (parent && (!parent.is_template || !parent.is_simple_expression)) {
-        sources.add(this.cstByID.get(parent.id)!.parent ?? parent.id);
+        sources.add(this.cstByID.get(parent.id)!.spawner ?? parent.id);
       }
     });
     const needCheckHead = () => {
@@ -142,7 +150,7 @@ export class RSFormLoader {
       } else if (sources.size !== 1) {
         return false;
       } else {
-        const base = this.cstByID.get(sources.values().next().value as ConstituentaID)!;
+        const base = this.cstByID.get(sources.values().next().value!)!;
         return !isFunctional(base.cst_type) || splitTemplateDefinition(base.definition_formal).head !== expression.head;
       }
     };
@@ -151,7 +159,7 @@ export class RSFormLoader {
       headDependencies.forEach(alias => {
         const parent = this.cstByAlias.get(alias);
         if (parent && !isBaseSet(parent.cst_type) && (!parent.is_template || !parent.is_simple_expression)) {
-          sources.add(parent.parent ?? parent.id);
+          sources.add(parent.spawner ?? parent.id);
         }
       });
     }
diff --git a/rsconcept/frontend/src/models/miscellaneousAPI.ts b/rsconcept/frontend/src/models/miscellaneousAPI.ts
index 27995dbd..6d077e90 100644
--- a/rsconcept/frontend/src/models/miscellaneousAPI.ts
+++ b/rsconcept/frontend/src/models/miscellaneousAPI.ts
@@ -44,6 +44,6 @@ export function applyNodeSizing(target: IConstituenta, sizing: GraphSizing): num
   } else if (sizing === 'complex') {
     return target.is_simple_expression ? 1 : 2;
   } else {
-    return target.parent ? 1 : 2;
+    return target.spawner ? 1 : 2;
   }
 }
diff --git a/rsconcept/frontend/src/models/rsform.ts b/rsconcept/frontend/src/models/rsform.ts
index 2b2c1584..9fdf612c 100644
--- a/rsconcept/frontend/src/models/rsform.ts
+++ b/rsconcept/frontend/src/models/rsform.ts
@@ -101,16 +101,31 @@ export interface IConstituentaData extends IConstituentaMeta {
  * Represents Constituenta.
  */
 export interface IConstituenta extends IConstituentaData {
+  /** {@link CstClass} of this {@link IConstituenta}. */
   cst_class: CstClass;
+  /** {@link ExpressionStatus} of this {@link IConstituenta}. */
   status: ExpressionStatus;
+
+  /** Indicates if this {@link IConstituenta} is a template. */
   is_template: boolean;
+  /** Indicates if this {@link IConstituenta} has a simple expression. */
   is_simple_expression: boolean;
+
+  /** {@link LibraryItemID} that contains parent of this inherited {@link IConstituenta}. */
+  parent_schema?: LibraryItemID;
+  /** Indicates if this {@link IConstituenta} is inherited. */
   is_inherited: boolean;
-  is_inherited_parent: boolean;
-  parent?: ConstituentaID;
-  parent_alias?: string;
-  children: number[];
-  children_alias: string[];
+  /** Indicates if this {@link IConstituenta} has children that are inherited. */
+  has_inherited_children: boolean;
+
+  /** {@link IConstituenta} that spawned this one. */
+  spawner?: ConstituentaID;
+  /** Alias of {@link IConstituenta} that spawned this one. */
+  spawner_alias?: string;
+  /** List of {@link IConstituenta} that are spawned by this one. */
+  spawn: number[];
+  /** List of aliases of {@link IConstituenta} that are spawned by this one. */
+  spawn_alias: string[];
 }
 
 /**
@@ -198,12 +213,22 @@ export interface IRSFormStats {
   count_theorem: number;
 }
 
+/**
+ * Represents inheritance data for {@link IRSForm}.
+ */
+export interface IInheritanceData {
+  child: ConstituentaID;
+  child_source: LibraryItemID;
+  parent: ConstituentaID;
+  parent_source: LibraryItemID;
+}
+
 /**
  * Represents data for {@link IRSForm} provided by backend.
  */
 export interface IRSFormData extends ILibraryItemVersioned {
   items: IConstituentaData[];
-  inheritance: ConstituentaID[][];
+  inheritance: IInheritanceData[];
   oss: ILibraryItemReference[];
 }
 
diff --git a/rsconcept/frontend/src/models/rsformAPI.ts b/rsconcept/frontend/src/models/rsformAPI.ts
index 0d05d075..96615d17 100644
--- a/rsconcept/frontend/src/models/rsformAPI.ts
+++ b/rsconcept/frontend/src/models/rsformAPI.ts
@@ -117,9 +117,9 @@ export function inferClass(type: CstType, isTemplate: boolean = false): CstClass
 export function createMockConstituenta(id: ConstituentaID, alias: string, comment: string): IConstituenta {
   return {
     id: id,
-    parent: id,
-    children: [],
-    children_alias: [],
+    spawner: id,
+    spawn: [],
+    spawn_alias: [],
     is_simple_expression: false,
     schema: -1,
     alias: alias,
@@ -134,7 +134,7 @@ export function createMockConstituenta(id: ConstituentaID, alias: string, commen
     status: ExpressionStatus.INCORRECT,
     is_template: false,
     is_inherited: false,
-    is_inherited_parent: false,
+    has_inherited_children: false,
     cst_class: CstClass.DERIVED,
     parse: {
       status: ParsingStatus.INCORRECT,
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
index 469b56f4..5f5ea0fa 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
@@ -249,7 +249,7 @@ function FormConstituenta({
                   icon={<IconSave size='1.25rem' />}
                 />
                 <Overlay position='top-[0.1rem] left-[0.4rem]' className='cc-icons'>
-                  {state.is_inherited_parent && !state.is_inherited ? (
+                  {state.has_inherited_children && !state.is_inherited ? (
                     <Indicator
                       icon={<IconPredecessor size='1.25rem' className='clr-text-primary' />}
                       titleHtml='Внимание!</br> Конституента имеет потомков<br/> в операционной схеме синтеза'
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/useGraphFilter.ts b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/useGraphFilter.ts
index 91870e2c..fc2462a5 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/useGraphFilter.ts
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/useGraphFilter.ts
@@ -45,7 +45,7 @@ function useGraphFilter(schema: IRSForm | undefined, params: GraphFilterParams,
     }
     if (!focusCst && params.foldDerived) {
       schema.items.forEach(cst => {
-        if (cst.parent) {
+        if (cst.spawner) {
           graph.foldNode(cst.id);
         }
       });
@@ -53,7 +53,7 @@ function useGraphFilter(schema: IRSForm | undefined, params: GraphFilterParams,
     if (focusCst) {
       const includes: ConstituentaID[] = [
         focusCst.id,
-        ...focusCst.children,
+        ...focusCst.spawn,
         ...(params.focusShowInputs ? schema.graph.expandInputs([focusCst.id]) : []),
         ...(params.focusShowOutputs ? schema.graph.expandOutputs([focusCst.id]) : [])
       ];
diff --git a/rsconcept/frontend/src/pages/RSFormPage/ViewConstituents/TableSideConstituents.tsx b/rsconcept/frontend/src/pages/RSFormPage/ViewConstituents/TableSideConstituents.tsx
index 11780219..8a8ec30a 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/ViewConstituents/TableSideConstituents.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/ViewConstituents/TableSideConstituents.tsx
@@ -109,13 +109,13 @@ function TableSideConstituents({
         }
       },
       {
-        when: (cst: IConstituenta) => !!activeCst && cst.parent === activeCst?.id && cst.id !== activeCst?.id,
+        when: (cst: IConstituenta) => !!activeCst && cst.spawner === activeCst?.id && cst.id !== activeCst?.id,
         style: {
           backgroundColor: colors.bgOrange50
         }
       },
       {
-        when: (cst: IConstituenta) => activeCst?.id !== undefined && cst.children.includes(activeCst.id),
+        when: (cst: IConstituenta) => activeCst?.id !== undefined && cst.spawn.includes(activeCst.id),
         style: {
           backgroundColor: colors.bgGreen50
         }
diff --git a/rsconcept/frontend/src/utils/codemirror.ts b/rsconcept/frontend/src/utils/codemirror.ts
index 88d180f3..054ffb6a 100644
--- a/rsconcept/frontend/src/utils/codemirror.ts
+++ b/rsconcept/frontend/src/utils/codemirror.ts
@@ -215,15 +215,15 @@ export function domTooltipConstituenta(cst?: IConstituenta, canClick?: boolean):
       dom.appendChild(convention);
     }
 
-    if (cst.parent_alias) {
+    if (cst.spawner_alias) {
       const derived = document.createElement('p');
-      derived.innerHTML = `<b>Основание:</b> ${cst.parent_alias}`;
+      derived.innerHTML = `<b>Основание:</b> ${cst.spawner_alias}`;
       dom.appendChild(derived);
     }
 
-    if (cst.children_alias.length > 0) {
+    if (cst.spawn_alias.length > 0) {
       const children = document.createElement('p');
-      children.innerHTML = `<b>Порождает:</b> ${cst.children_alias.join(', ')}`;
+      children.innerHTML = `<b>Порождает:</b> ${cst.spawn_alias.join(', ')}`;
       dom.appendChild(children);
     }